hello, I am receiving an error . It says Undefined function or variable 'grayImage'. please let me know how i can define the function . here is my code

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mahesh makam
mahesh makam 2020-3-30
评论： mahesh makam 2020-4-1
[pixelCount, grayLevels] = imhist(grayImage);
bar(grayLevels, pixelCount); % Plot it as a bar chart.
grid on;
title('Histogram of original image', 'FontSize', fontSize);
xlabel('Gray Level', 'FontSize', fontSize);
ylabel('Pixel Count', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.

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Peng Li
Peng Li 2020-3-30
you have to have image data first which the grayImage is supposed to be. you can use imread to read an image in your disk for example.
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